Remove catapult_base from telemetry.

tools/telemetry/catapult_base/refactor/annotated_symbol/base_symbol.py

-# Copyright 2015 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-from catapult_base.refactor import snippet
-
-
-class AnnotatedSymbol(snippet.Symbol):
-  def __init__(self, symbol_type, children):
-    super(AnnotatedSymbol, self).__init__(symbol_type, children)
-    self._modified = False
-
-  @property
-  def modified(self):
-    if self._modified:
-      return True
-    return super(AnnotatedSymbol, self).modified
-
-  def __setattr__(self, name, value):
-    if (hasattr(self.__class__, name) and
-        isinstance(getattr(self.__class__, name), property)):
-      self._modified = True
-    return super(AnnotatedSymbol, self).__setattr__(name, value)
-
-  def Cut(self, child):
-    for i in xrange(len(self._children)):
-      if self._children[i] == child:
-        self._modified = True
-        del self._children[i]
-        break
-    else:
-      raise ValueError('%s is not in %s.' % (child, self))
-
-  def Paste(self, child):
-    self._modified = True
-    self._children.append(child)